Acid2 is passing - don't mark it as failing.

Bug: 769508
Change-Id: I32e58b403f2f0e279091b7209aedaa69c4e9b5cb
Reviewed-on: https://chromium-review.googlesource.com/c/1345010Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609986}

third_party/WebKit/LayoutTests/TestExpectations

@@ -147,7 +147,6 @@ crbug.com/623268 http/tests/inspector-protocol/request-mixed-content-status-opti
 crbug.com/678482 http/tests/devtools/debugger/fetch-breakpoints.js [ Timeout Pass ]
 crbug.com/678491 http/tests/misc/webtiming-no-origin.html [ Crash Pass ]
 crbug.com/765779 http/tests/loading/bad-server-subframe.html [ Failure ]
-crbug.com/769508 fast/css/acid2.html [ Failure ]
 crbug.com/778372 external/wpt/html/browsers/origin/cross-origin-objects/cross-origin-objects.html [ Crash ]
 crbug.com/793127 external/wpt/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html [ Crash ]
 crbug.com/793127 http/tests/security/upgrade-insecure-requests/iframe-upgrade.https.html [ Crash ]

third_party/WebKit/LayoutTests/VirtualTestSuites

@@ -897,11 +897,6 @@
     "base": "external/wpt/wasm/serialization/window-similar-but-cross-origin-success.sub.html",
     "args": ["--disable-site-isolation-trials"]
   },
-  {
-    "prefix": "not-site-per-process",
-    "base": "fast/css/acid2.html",
-    "args": ["--disable-site-isolation-trials"]
-  },
   {
     "prefix": "not-site-per-process",
     "base": "http/tests/devtools/debugger/fetch-breakpoints.js",